It's not necessarily, but I just don't have the desire to exercise for that long anyway. I probably still do sometimes even if that is not the intent. But in recent years, I have just become lazy and need to rediscover my mojo, I admit it.
Years ago, some of my workouts would last two hours. Which seems a bit much but I was dedicated, much more than now.
I have some longer workouts, Firms mainly that are about an hour and while I have every intention of keeping them, I haven't reached for in a while. I plan to use the chaptering that comes with the remasters and shorten a bit, I bet they will get more use that way.